Limits on Anomalous Top Couplings from Z Pole Physics

Details Limits on Anomalous Top Couplings from Z Pole Physics Limits on Anomalous Top Couplings from Z Pole Physics

1997-04-24

arxiv.org/abs/hep-ph/9704400v2

Phys.Lett. B415 (1997) 75-82

Physics

High Energy Physics

High Energy Physics - Phenomenology

expanded version, 14 pages, 1 figures added

Scientific paper

10.1016/S0370-2693(97)01230-6

We obtain constraints on possible anomalous interactions of the top quark with the electroweak vector bosons arising from the precision measurements at the Z pole. In the framework of $SU(2)_L \otimes U(1)_Y$ chiral Lagrangians, we examine all effective CP-conserving operators of dimension five which induce fermionic currents involving the top quark. We constrain the magnitudes of these anomalous interactions by evaluating their one-loop contributions to the Z pole physics. Our analysis shows that the operators that contribute to the LEP observables get bounds close to the theoretical expectation for their anomalous couplings. We also show that those which break the $SU(2)_C$ custodial symmetry are more strongly bounded.

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